Pictures of the day: 11 September 2012

A self-portrait of NASA's Mars rover Curiosity, combining nine images taken by the rover's Mars Hand Lens Imager (MAHLI) during the 34th Martian day, or sol, of Curiosity's work on Mars. Fine-grain Martian dust can be seen adhering to the wheels.Picture: EPA/NASA/JPL-Caltech/Malin Space Science Systems